Piston.



No. 767,017. PATENTED AUG. 9, 1904-.

D. F. STAYMAN.

PISTON.

APPLIOATIOH FILED D2012, 1903. no MODEL.

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UNITED STATES Patented August 9, 1904. l

PATENT OFFICE.

PISTON.

SPECIFIClATION forming part of Letters Patent No. 767,017, dated, August 9, 1904.

Application filed December 12, 1903. Serial No. 184,882. (No modem To (all whom, it may concern:

Be it known that I, DAVID F. STAYMAN, a citizen of the United States, residing at Baltimore, State of Maryland, have invented certain new and useful Improvements in Pistons, of which the following is a specification.

This invention relates to improvements in the construction of packing-rings for pistons for use as valves for steam-engines or as driving-pistons in the cylinder.

One object of the invention is to provide an improved packing-ring for the sliding face of the piston yieldingly mounted, whereby the same may be readily put into position, and which will readily adjust itself to the cylinder or valve-pocket as the same wears.

Another object of the invention is to pro vide a sliding facefor the piston consisting of a plurality of segmental sections, each of which at one part has a face comprising the full width of the piston and has ends that overlap the corresponding ends of the other sections.

The invention is illustrated in the accompanying drawings, in which- Figure 1 is a side elevation of a piston-valve embodying the invention, one end in side view and one end sectioned vertically as would appear on the line 1 1 of Fig. 2. Fig. .2 is a vertical sectional view of one piston-head on the line 2 2 of Fig. 1, the cap-disk being removed. Figs. 3, 4, and 5 are detail views of one of the face-ring sections.

In the drawings the device is illustrated as applied to a piston-valve which employs two piston-heads; but it is to be understood that it may be applied to any form of valve, piston, or plunger which is movable in a cylinder.

Referring to the drawings, the letter A designates the stem of a piston-valve, having two heads B, each of which is provided with circular head-flanges Z) and 6, separated so as to form an annular space 0. It is obvious that these head-flanges need not be formed integral with the head. As illustrated in the drawings, the outer flange, Z), is in the form of a cap-disk, while the other flange, Z), is integral.

A plurality of segmental sections are em ployed, in the present instance three in numleer, each of which comprises circumferential face-pieces (Z d, overlapping each other and contact and overlap and together form a central inturned flange which occupies and fills the said annular head-space c. That portion of the circumferential face which extends at right angles with respect to said central flange f forms a rim-flange (Z which takes over the flanges 7) 7/ of the head. The face of the overlapped part of each segmental section has a width which comprises the full width of the piston.

In the assembled device, as shown in section at Fig. 1, a flat spring-band g has position in the annular space 0, between the headflanges Z) and Z), and said spring-band has a tendency to expand or press outwardly against the central inturned flanges f and causes the circumferential faces (Z cl to [it close against the internal wall of the piston-cylinder. (Not shown.)

The piston-rod h in this case has a shank it of reduced size extending through the part A, and the cap-disk Z) lite on the extremity of the shank, and a nut v1 confines the cap-disk.

I/V hen all the segmental sections are placed in position, the same may be compressed against the action of the spring-band g. This compression diminishes the circumference, and while in such compressed condition the piston may be readily inserted in the cylinder or valve-pocket and the nallowed to expand so as to snugly fill the said cylinder or pocket.

It is obvious that as the cylinder or piston face wears the segmental sections will be correspondingly expanded to maintain a steamtight fit in the cylinder.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A piston having a head provided with two circular head-flanges forming between them an annular recess, in combination with a band-spring extending around said recess, and a plurality of segmental sections each having a central inturned flange which takes in said annular recess and also has at each side I00 of said central flange a laterally-projecting flange which takes over the said circular headflanges and ends that overlap corresponding ends of the next section.

2. A piston having a head provided with two circular head-flanges with an annular recess between them, in combination with a band-spring extending around said recess, and a plurality of segmental sections each having a central inturned flange, f, which takes in said recess and also having rim-flanges, (Z extending at right angles to said inturned flange and taking over the said head-flanges, said sections being narrower at their ends than at points between the ends and the ends of one section overlapping the end of the next adjoining section.

3. A piston having a head provided with DAVID F. STAYMAN.

\Vitnesses:

CHAs. B. MANN. G. FERDINAND Voe'r. 

